10 DownMix User ManualRear PanelAES INPUTS - Four 75Ω BNC connectors will accept an AES3 digital audio stream.AES OUTPUTS - Three 75Ω BNC connectors output the down mixed AES3 digital audio stream.AES SYNC - Two 75Ω BNC connectors that allow DownMix to receive an AES REF or DARSclock signal from an external source and pass it on to other devices.The AES-3id-1995/SMPTE 276M standard dictates a 75Ω unbalanced connection and requiresproper termination. The termination should occur at the destination of the signal (that is, on theinputs to DownMix). If the loop-through BNC connectors are not feeding additional equipment,terminate each of these with a standard 75Ω terminator. Like other inputs, AES SYNC signalshould be terminated.GPIO – A Female DB-9 connection that allows DownMix to be monitored or controlled externally.Opto-isolated inputs will be triggered by a voltage of 5VDC.DB-9 Female Porton DownMix Rear PanelOutput 1: Relay 1 is Normally Open. Upon a hardware failure (i.e. Power Supply or InternalCommunications Failure), the relay will close. When the failure is remedied, the relay will open.Output 2: Relay 2 is Normally Open. Upon an AES lock loss failure, this relay will close. Whenthe failure is remedied, the relay will open.Pin Signal1 Output Relay 1 N.O.2 Relay 1 Common3 Optical Input 04 Optical Input 15 Optical InputCommon6 Output Relay 2 N.O.7 Relay 2 Common8 Optical Input 29 Optical Input 3